My 0.010000 dollar opinion. Two weeks after trying it out, I've had it. It's actually nice except for the crashes - which I get lots of. So, I lose the code I'm trying out. Its auto-completion doesn't even help redeem it. I'm back to the robust iPython shell, now with ipdb installed, it gives iPython the auto-completion I'm after in bpython.
If only it could be more forgiving for newbies like me, and crashed much, much less ... /r Nik